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I know lots of folks using RO water, and pretty much everyone uses CaSO4 & MgSO4 to boost GH.

I keep mine at Ca:Mg 30:15, but really your 25:12.5 or really anything in that range should be fine.

As to KH, I dose mine to 1.0 dKH. But again, anything in that very low range should be fine.

Do keep in mind the K being added from KHCO3. I use MgNO3 instead of KNO3 to keep K levels in line.
 
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